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No. That was the big lie. Delta and the FAA both recommend seats for infants as being safer than lap carry. The attendant had no idea of the rules. If you listen carefully she admits to having just looked them up. I think she made them up.

Did you know that the safest place for your child on an airplane is in a government-approved child safety restraint system (CRS) or device, not on your lap? Your arms aren't capable of holding your child securely, especially during unexpected turbulence.

The Federal Aviation Administration (FAA) strongly urges you to secure your child in a CRS or device for the duration of your flight. It's the smart and right thing to do so that everyone in your family arrives safely at your destination. The FAA is giving you the information you need to make informed decisions about your family's travel plans.

https://www.faa.gov/passengers/fly_children/